Insulator.



No. 682,709. Patented Sept. I7, I90I.l

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UNITED STATES PATENT OEEICE.

IVILTON F. JENKINS, OF RICHMOND, VIRGINIA.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 682,709, dated.ISeptember 17, 1901-.

Application tiled February 7 1901. Serial No. 46,405. (No model.)

To @ZZ whom, t may concern.-

Be it known that I, WILroN F. JENKINS, a citizen of the United States,and a resident of Richmond city, State of Virginia, have inventedcertain new and useful Improvements in Insulators, of which thefollowingis a speciiication.

My invention relates to underground-conduit electric railways; and itconsists of insulating means Jior supporting the conductors.

In the drawings which accompany and form a part of this specificationand in which like numerals refer to like parts in the different views,Figures I, II, III, and IV are views of the insulator in side elevation,vertical section, front elevation, and plan, respectively. Fig. V showsin plan the bottom of the insulator-petticoat. Fig. VI shows in plan theinsulator bracket or support. Fig. VII shows the nut-locking wire.

In Figs. I, II, III, and IV, 1 is the insulator-petticoat, made ofnon-conducting material and having the annular projecting ribs 2 2 andterminating at its upper end in a neck 3. (See Fig. II.) This neck 3engages in an aperture 4, cut in the bottom of the casing 5 and soassists in keeping the latter in place. The casing 5 is made in the formof a box and is provided with a cap 6. The interior of the casing 5 isilled with non-conducting material 7, which is formed around the head 8of the bolt 9, which bolt passes through a central hole 19 in thepetticoat 1 and, proj ecting below the latter, forms means whereby theparts of the insulator may be held together and whereby the insulatormay be secured to the bracket 10. The non-conducting material 7 ispreferably of that kind which is liquid when hot and which sets hard oncooling. It then can be cast around the head 8 of the bolt 9 and soactually form a head to the said bolt, while it insulates it from itssurroundings. The interiorot the casing 5 instead of being cylindricalin form has one or more flats 11 11, (see Fig. IV,) their object beingto prevent the non-conducting material 7, and consequently the bolt 9,from turning when the latter is tightened up. The cap 6 is held in placeby the screws 12 12, which, passing through the cap, enter the walls ofthe casing 5.

10 is the insulator support or bracket, which consists of a plate 13 andmeans for rigidly attaching the said plate to some part of the conduitstructure. Such a part may be the conduit-yokes, which are placed atintervals along the conduit for the purpose, among others, of supportingthe slot-rails. In that case the brackets 10 may be provided with feet14 14, which may be bolted to the lyoke-post or which may be secured tothe said yoke in any suitable manner.

I prefer to provide the plate 13 ofthe bracket 10 with a projecting ring15, the object of which is to add security to the insulator and tostrengthen the plate 13, the lower extremity of the petticoat being madeof such a dialneter that it will t neatly within the ring 15.

In the center of the plate 13 of the bracket 10 is an aperture 16,considerably larger in diameter than the bolt 9. In this aperture aprojecting piece 17 on the bottom of the petticoat lits accurately. Thenut 1S of the bolt 9 is large enough to extend beyond the walls of theaperture 16 and comes to a bearing against the under side of the plate13. The petticoat 1 having been placed in position on the bracket 10,the casing 5 is placed on the petticoat 1, so that the neck 3 of thelatter engages in the aperture 4 in the bottom of the said casing. Thebolt 9, having its head 8 cased in the non-conducting material 7, isthen dropped into place. The nut 18 being run onto the threaded end ofthe bolt 9 and tightened up, the casing 5 will be held firmly to thepetticoat 1, and the latter will be firmly secured to the bracket 10. Anut-locking wire 20 may be used to prevent the nut 18 from slacking,grooves 21 2l, Fig. VI, being cut in the under side of the bracket 1()to re ceive it. The said wire having been laid to the grooves 21 and thenut 18 tightened up, the looped end of the wire is turned down againstthe nut, Figs. I, II, and III, to prevent the latter from turningaccidentally.

It will be seen'from Fig. II that the casing 5 is perfectly insulatedfrom the bracket 10, the petticoatl separating them from one another andfrom its shape preventing the formation of a continuous line of moisturebetween them, and the non-conducting material 7 preventing any iiow ofthe current between the casing 5 and the bolt 9.

In the bottom face of the petticoat 1 are IOO cast grooves 22 22, &c.,Figs. II and V, and holes 23 23, &c., are cored in the plate 13 of thebracket 10. Any moisture which may condense or otherwise accumulateabout the bottom of the petticoat will find its way along the grooves 22to the holes 23 and so escape. f

1. In an\insulator, the combination of abracket,an insulating-petticoatcentrally perforated, a bolt passing downward through the perforation inthe petticoat and having its head incased in insulating material, acasing resting on the petticoat and surrounding the insulating-head ofthe bolt, a cap to the casing covering the insulating-head of the bolt,and means to secure the bolt to secure the parts of the insulator inposition on the f bracket, substantially as described.

2. An insulator consisting of a centrallyperforated insulating-petticoathaving downwardly-curved exterior surfaces and one or more dependingounces and provided on its upper end with a vertically-projecting neck,

a waterprooing-casing resting on the top of the insulator andsurrounding the neck thereof which it. iits closely, a bolt the head ofwhich is embedded in an enlarged insulatingblock, said block filling andtting into the casing when the .bolt is passed through the petticoat,and a cover for the casing, substantially as described.

3. An insulator consisting of a centrallyperforated insulating-petticoathaving downwardly-curved exterior surfaces and one or more dependingflounces and provided on its upper end with a vertically-projectingneck, a waterproong-casing resting on the top of the insulator andsurrounding the neck thereof which it fits closely, a bolt the head ofwhich is embedded in an enlarged insulatingblock, said block filling andfitting into the casing when -the bolt ispassed through the petticoat, acover for the casing, and a supporting-bracket to which the insulator issecured by a nut threaded onto the lower end of the bolt, substantiallyas described.

4:. An insulator consisting of an insulatingpetticoat provided on itsupper end with a vertically-projecting neck, a casing resting on the topof the petticoat and surrounding the neck thereof which it fits closelyand provided with means for supporting a conduc-v tor, and insulatedmeans whereby the petticoat and casing are secured to one another.

Signed at Richmond, in the county of Henrico and State of Virginia, this24th day' of January, A. D. 1901.

W. F. JENKINS.

Witnesses:

EUGENE JONES, ARTHUR SpoRIvENoR.

